11-18-2015
First of all you have to specify, what kind of UNIX or Linux you have. Messages about successful logons can be very different and can be found in different places on different UNIXes.
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J0(3) BSD Library Functions Manual J0(3)
NAME
j0, j0f, j1, j1f, jn, jnf, y0, y0f, y1, y1f, yn, ynf -- Bessel functions of first and second kind
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
j0(double x);
float
j0f(float x);
double
j1(double x);
float
j1f(float x);
double
jn(int n, double x);
float
jnf(int n, float x);
double
y0(double x);
float
y0f(float x);
double
y1(double x);
float
y1f(float x);
double
yn(int n, double x);
float
ynf(int n, float x);
DESCRIPTION
The functions j0(), j0f(), j1() and j1f() compute the Bessel function of the first kind of the order 0 and the order 1, respectively, for the
real value x; the functions jn() and jnf() compute the Bessel function of the first kind of the integer order n for the real value x.
The functions y0(), y0f(), y1() and y1f() compute the linearly independent Bessel function of the second kind of the order 0 and the order 1,
respectively, for the positive integer value x (expressed as a double); the functions yn() and ynf() compute the Bessel function of the
second kind for the integer order n for the positive integer value x (expressed as a double).
RETURN VALUES
If these functions are successful, the computed value is returned, otherwise the global variable errno is set to EDOM and a reserve operand
fault is generated.
SEE ALSO
math(3)
HISTORY
This set of functions appeared in Version 7 AT&T UNIX.
BSD
April 19, 1991 BSD